Java教程

Java在数组中查找第二大数字

通过对数组进行排序并返回第二大数字,我们可以在Java中找到第二大数字。让我们看一下完整的示例,以找到java数组中的第二大数字。
public class SecondLargestInArrayExample{
    public static int getSecondLargest(int[] a, int total){
        int temp;
        for (int i = 0;i <total;i++) {
            for (int j = i + 1;j <total;j++) {
                if (a[i] >a[j]) {
                    temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
        return a[total-2];
    }
    public static void main(String args[]){
        int a[]={1,2,5,6,3,2};
        int b[]={44,66,99,77,33,22,55};
        System.out.println("Second Largest: "+getSecondLargest(a,6));
        System.out.println("Second Largest: "+getSecondLargest(b,7));
    }
}
输出:
Second Largest: 5Second Largest: 77

使用数组查找数组中的第二大数字

让我们看看另一个示例,使用集合来获取Java数组中第二大的元素或数字。
import java.util.Arrays;
public class SecondLargestInArrayExample1{
    public static int getSecondLargest(int[] a, int total){
        Arrays.sort(a);
        return a[total-2];
    }
    public static void main(String args[]){
        int a[]={1,2,5,6,3,2};
        int b[]={44,66,99,77,33,22,55};
        System.out.println("Second Largest: "+getSecondLargest(a,6));
        System.out.println("Second Largest: "+getSecondLargest(b,7));
    }
}
输出:
Second Largest: 5Second Largest: 77

使用集合在数组中查找第二大数字

让我们看看另一个示例,使用集合在java数组中获取第二大数字。
import java.util.*;
public class SecondLargestInArrayExample2{
    public static int getSecondLargest(Integer[] a, int total){
        List<Integer> list=Arrays.asList(a);
        Collections.sort(list);
        int element=list.get(total-2);
        return element;
    }
    public static void main(String args[]){
        Integer a[]={1,2,5,6,3,2};
        Integer b[]={44,66,99,77,33,22,55};
        System.out.println("Second Largest: "+getSecondLargest(a,6));
        System.out.println("Second Largest: "+getSecondLargest(b,7));
    }
}
输出:
Second Largest: 5Second Largest: 77
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